Mike K. and I are working on resurrecting a Cromemco System 3 This is a large S-100 rack-mount unit with dual 8" floppy drives and internal hard drive. Got it powered up yesterday, and all DC supplies appear normal. Managed to get it working to the point where it tries to boot from the A drive (floppy) - unfortunately we have no boot diskette. We able to get into the 'RDOS' ROM monitor for which we have no documentsion. Discovered the 'BA-BD' commands which try and boot: BA accesses the first 8" floppy, BB accesses the second 8" floppy. BC&BD just "hang". Also discovered an 'I' command (IPL?) which also hangs... We were not able to get any action from the hard drive - I don't know if it would be booted by 'BC', 'BD' or 'I' (or something else). I did note that the HD power was disconnected when we opened the box, so I do not know if the hard drive even works. Q1) Does anyone out there have a boot diskette for a Cromemco System 3? I'm pretty sure that if we had a boot diskette we could bring the system up. Q2) Can anyone tell be exactly what needs to be done to boot the hard drive? Are there any diagnostic procedures that we can use to confirm that the HD is operating? Any information or pointers to information on this system would be very much appreciated. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html